Standard: GB /T 33943 - 2017
Available sizes: (M22) to M36 (8 sizes)
| Size | P | k_max | k_min | s_max | s_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|
| (M22) | 28 | 5 | 5.6 | 28.52 | 50 | 49 | 4.4 |
| (M27) | 40.4 | 6 | 6.6 | 41.02 | 72 | 70.8 | 5.4 |
| (M33) | 54 | 10 | 11.2 | 54.74 | 100 | 98.4 | 8.8 |
| (M39) | 66 | 10 | 11.2 | 66.74 | 115 | 113.6 | 8.8 |
| M20 | 23 | 5 | 5.6 | 23.52 | 39 | 38 | 4.4 |
| M24 | 34 | 5 | 5.6 | 34.62 | 60 | 58.8 | 4.4 |
| M30 | 46.4 | 8 | 9.2 | 47.02 | 85 | 83.6 | 6.8 |
| M36 | 62 | 10 | 11.2 | 62.74 | 110 | 107.8 | 8.8 |
Standard corrosion protection for indoor and mild outdoor environments.
Salt spray: 96–200 hours | RoHS compliant (trivalent chromium)
High-performance coating for automotive, marine, and harsh environments.
Salt spray: 720–1500 hours | Recommended for grade 8.8+
Heavy-duty protection for structural and outdoor applications.
Salt spray: 500–1000 hours | Thread tolerance adjustment required
Note for high-strength fasteners (Grade 10.9, 12.9): Electroplating processes require hydrogen embrittlement relief baking (minimum 4 hours at 200°C within 4 hours of plating). Contact our engineering team for grade-specific plating recommendations.
Request detailed technical specifications, material certifications, and availability information for your application requirements. Our engineering team can provide product recommendations, custom specifications, and technical documentation.
© 2026 Ningbo Ruixi Metal Surface Technology Co., Ltd.. All rights reserved.